It's really the only viable answer to piracy that's left and publishers are embracing it wholeheartedly.
I used to pirate games and I used to buy games. I eventually couldn't be bothered with pirating and worrying about malware or with trying to jump through the hoops that the publishers wanted, so I stopped playing games altogether. Then gog.com launched and sold me games that I was nostalgic about, cheaply. Then they started selling newer games. I spent more with them last six months than I did on total on games in the five years since Steam was launched and the industry wend DRM-happy. I can download DRM-free installers for all of the games, often in OS X, Windows, and Linux versions.
It turns out that there's another answer to piracy that works: sell your product in a way that's easy to use at a reasonable price. Stop worrying about pirates and start worrying about customers. Someone who wouldn't buy your game anyway who pirates it is not a lost sale, but someone who can't be bothered to put up with your treating them like a criminal and so doesn't buy from you is. Buying a game from gog.com is easier than pirating and, if you factor in the cost of your time, probably cheaper as well.
Give me a product I want for a reasonable price and I will happily hand over my money, because I feel that I'm getting something valuable in return. Don't, and... well, computer games are not the only form of entertainment available.